Originally Posted by redqueen2012

I have traveled twice already on the humanitarian AP, and I can say with certainty that you do not need a lawyer to prepare the package. I have done it for myself and those around me, and if you only have the capacity of neatly organizing documents into an orderly packet, you are pretty much all set.

As far as the doctor's letter is concerned, mine (well, the one for my grandmother) was not specifically in a letter format.
It was rather a documentation which disclose her medical conditions. Of course it had her personal information such as her name, age, DOB, along with the types of medical attention she was receiving. Her conditions were indicated with international disease classification or ICD, and because, as its name implies, it is an internationally accepted medical code, it was pretty much self-explanatory own its own, not requiring much of translation. I did not include any further medical documents such as X-rays or other formal stuffs, and the USCIS never required further evidences in both cases.